Question

ajutor dau coroana!!​

Answer 1

$1. \: \sqrt{45} = \sqrt{3 {}^{2} \times 5} = 3 \sqrt{5} \implies a = 3 \\ 2. \: \frac{a}{b} = 0.4\implies \frac{b}{a} = \frac{1}{0.4} = 2.5 \\ 3. \: \frac{109}{3} = 36.(3)\implies cel \: mai \: mare \: nr. \\ prim \: este31\iff \: adevarat \\ \\ 4. \: a - 2b = - 6 \\ a + 2b = 337 \\ \implies \: 2a = 331\implies a = \frac{331}{2} \\ \implies \: b = \frac{343}{4} \\ \implies 4b {}^{2} - a {}^{2} = \frac{343 {}^{2} }{4} - \frac{331 {}^{2} }{2 {}^{2} } \\ \\ = \frac{(343 - 331)(343 + 331)}{4} \\ \\ = \frac{12 \times 674}{4} = 3 \times 674 = 2022$

Answer 2

Rezolvarea in poza, succes